Right now in str.format(), we have !s, !r, and !a to allow us to call str(),
repr(), and ascii() respectively on the given expression.
I'm proposing that we add a !p conversion to have pprint.pformat() be called to
convert the given expression to a 'pretty' string.
Calling
```
print(f"My dict: {d!p}")
```
is a lot more concise than:
```
import pprint
print(f"My dict: {pprint.pformat(d)}")
```
We may even be able to have a static attribute stored to change the various
default kwargs of pprint.pformat().
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